#include <stdio.h>


int main()
{
    int a,i,m;
    printf("There are following perfect numbers smaller than 1000:\n");
    for(a= 1;a <1000;a++)
    {
        for(m = 0,i = 1;i <= a/2;i++)
        {
            if(!(a%i))
            {
                m += i;
            }
        }
        if(m == a)
        {
            printf("%4d\t",a);
        }
    }

    return 0;
}

//熊贤豪